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Sorption of Cesium From Aqueous Waste Solution on SuperLig 644 Resin
The removal of cesium from aqueous waste solution was investigated in a column setup using SuperLig(R) 644 resin. The resin was significantly coarser in size than those used in previous studies because of hydraulic problems encountered during pilot-scale tests. The bed volume (BV = 140) at the onset of breakthrough surpassed the design requirement of 100 BV at 50 percent breakthrough. The percent of cesium removed by the resin at the onset of breakthrough was 99.96. The elution of cesium with 0.5 M HNO3 was satisfactory with a peak BV of 2.5. The elution BV for C/Co = 0.01 was 10, which is less than the target of 15 BV. The percent of sorbed cesium eluted from the resin was 99.88 percent. In addition, the BV of the various solutions used for the supporting process steps (feed displacement, post-feed displacement rinse, post-elution rinse, and regeneration) of the cesium ion exchange system was sufficient.
Date:
August 24, 2004
Creator:
ADU-WUSU, KOFI
Object Type:
Article
System:
The UNT Digital Library
Optimizing the Delivery of Short-Lived Alpha Particle-Emitting Isotopes to Solid Tumors
The underlying hypothesis of this project was that optimal alpha emitter-based radioimmunotherapy (RAIT) could be achieved by pairing the physical half-life of the radioisotope to the biological half-life of the targeting vehicle. The project had two specific aims. The first aim was to create and optimize the therapeutic efficacy of 211At-SAPS-C6.5 diabody conjugates. The second aim was to develop bispecific-targeting strategies that increase the specificity and efficacy of alpha-emitter-based RAIT. In the performance of the first aim, we created 211At-SAPS-C6.5 diabody conjugates that specifically targeted the HER2 tumor associated antigen. In evaluating these immunoconjugates we determined that they were capable of efficient tumor targeting and therapeutic efficacy of established human tumor xenografts growing in immunodeficient mice. We also determined that therapeutic doses were associated with late renal toxicity, likely due to the role of the kidneys in the systemic elimination o f these agents. We are currently performing more studies focused on better understanding the observed toxicity. In the second aim, we successfully generated bispecific single-chain Fv (bs-scFv) molecules that co-targeted HER2 and HER3 or HER2 and HER4. The in vitro kinetics and in vivo tumor-targeting properties of these molecules were evaluated. These studies revealed that the bs-scFv molecules selectively …
Date:
November 24, 2004
Creator:
Adams, Gregory P.
Object Type:
Report
System:
The UNT Digital Library
B-factory signals for a warped extra dimension
We study predictions for B-physics in a class of models, recently introduced, with a non-supersymmetric warped extra dimension. In these models few ({approx} 3) TeV Kaluza-Klein masses are consistent with electroweak data due to bulk custodial symmetry. Furthermore, there is an analog of GIM mechanism which is violated by the heavy top quark (just as in SM) leading to striking signals at B-factories: (1) New Physics (NP) contributions to {Delta}F = 2 transitions are comparable to SM. This implies that, within this NP framework, the success of the SM unitarity triangle fit is a ''coincidence''. Thus, clean extractions of unitarity angles via e.g. B {yields} {pi}{pi}, {rho}{pi}, {rho}{rho}, DK are likely to be affected, in addition to O(1) deviation from SM prediction in Bs mixing. (2) O(1) deviation from SM predictions for B {yields} X{sub s}{ell}{sup +}{ell}{sup -} in rate as well as in forward-backward and direct CP asymmetry. (3) Large mixing-induced CP asymmetry in radiative B decays, wherein the SM unambiguously predicts very small asymmetries. Also, with KK masses 3 TeV or less, and with anarchic Yukawa masses, contributions to electric dipole moments of the neutron are roughly 20 times larger than the current experimental bound so that this …
Date:
August 24, 2004
Creator:
Agashe, Kaustubh; Perez, Gilad & Soni, Amarjit
Object Type:
Article
System:
The UNT Digital Library
Evaporative Evolution of a Na-Cl-NO3-K-Ca-SO4-Mg-Si Brine at 95(degree)C: Experiments and Modeling relevant to Yucca Mountain, Nevada, USA
A synthetic Topopah Spring Tuff water representative of one type of pore water at Yucca Mountain, Nevada (USA) was evaporated at 95 C in a series of experiments to determine the geochemical controls for brines that may form on, and possibly impact upon the long-term integrity of waste containers and drip shields at the designated high-level, nuclear-waste repository. Solution chemistry, condensed vapor chemistry, and precipitate mineralogy were used to identify important chemical divides and to validate geochemical calculations of evaporating water chemistry using a high temperature Pitzer thermodynamic database. The water evolved towards a complex ''sulfate type'' brine that contained about 45 mol% Na, 40 mol% Cl, 9 mol% NO{sub 3}, 5 mol% K, and less than 1 mol% each of SO{sub 4}, Ca, Mg, {Sigma}CO{sub 2}(aq), F, and Si. All measured ions in the condensed vapor phase were below detection limits. The mineral precipitates identified were halite, anhydrite, bassanite, niter and nitratine. Trends in the solution composition and identification of CaSO{sub 4} solids suggest that fluorite, carbonate, sulfate, and magnesium-silicate precipitation control the aqueous solution composition of sulfate type waters by removing fluoride, calcium, and magnesium during the early stages of evaporation. In most cases, the high temperature Pitzer …
Date:
August 24, 2004
Creator:
Alai, M; Sutton, M & Carroll, S A
Object Type:
Article
System:
The UNT Digital Library
Timpson & Tenaha News (Timpson, Tex.), Vol. 19, No. 26, Ed. 1 Thursday, June 24, 2004
Weekly newspaper from Timpson, Texas that includes local, state, and national news along with advertising.
Date:
June 24, 2004
Creator:
Alexander, Nancy
Object Type:
Newspaper
System:
The Portal to Texas History
Ion Acceleration from the Interaction of Ultra-Intense Lasers with Solid Foils
The discovery that ultra-intense laser pulses (I > 10{sup 18} W/cm{sup 2}) can produce short pulse, high energy proton beams has renewed interest in the fundamental mechanisms that govern particle acceleration from laser-solid interactions. Experiments have shown that protons present as hydrocarbon contaminants on laser targets can be accelerated up to energies > 50 MeV. Different theoretical models that explain the observed results have been proposed. One model describes a front-surface acceleration mechanism based on the ponderomotive potential of the laser pulse. At high intensities (I > 10{sup 18} W/cm{sup 2}), the quiver energy of an electron oscillating in the electric field of the laser pulse exceeds the electron rest mass, requiring the consideration of relativistic effects. The relativistically correct ponderomotive potential is given by U{sub p} = ([1 + I{lambda}{sup 2}/1.3 x 10{sup 18}]{sup 1/2} - 1) m{sub o}c{sup 2}, where I{lambda}{sup 2} is the irradiance in W {micro}m{sup 2}/cm{sup 2} and m{sub o}c{sup 2} is the electron rest mass. At laser irradiance of I{lambda}{sup 2} {approx} 10{sup 20} W {micro}m{sup 2}/cm{sup 2}, the ponderomotive potential can be of order several MeV. A few recent experiments--discussed in Chapter 3 of this thesis--consider this ponderomotive potential sufficiently strong to accelerate …
Date:
November 24, 2004
Creator:
Allen, M
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Oral History Interview with Thomas Alt, August 24, 2004
The National Museum of the Pacific War presents an interview with Thomas Alt. Alt joined the Aviation Cadet Corps in June of 1942 at the age of 17. By January of 1943, once he turned 18, he was called up for training. In mid-1943 he traveled to Pearl Harbor, and completed Fire Fighting School with the Navy while on the island. In mid-1944 Alt was assigned to the USS Sea Cat (SS-399). He worked as Military Police on night shifts and guard duty in the brig. They traveled to Saipan and the South China Sea where the Sea Cat operated in a wolf pack. He landed on Saipan 7 July 7, as the battle was coming to an end. He served with a firefighting crew on the beach for pilots making emergency or crash landings. Alt remained on Saipan through early 1945. He was stationed on Tinian in July, and recalls when the Enola Gay landed. He returned to the US and was discharged in March of 1945.
Date:
August 24, 2004
Creator:
Alt, Thomas
Object Type:
Sound
System:
The Portal to Texas History
Oral History Interview with Thomas Alt, August 24, 2004
The National Museum of the Pacific War presents an interview with Thomas Alt. Alt joined the Aviation Cadet Corps in June of 1942 at the age of 17. By January of 1943, once he turned 18, he was called up for training. In mid-1943 he traveled to Pearl Harbor, and completed Fire Fighting School with the Navy while on the island. In mid-1944 Alt was assigned to the USS Sea Cat (SS-399). He worked as Military Police on night shifts and guard duty in the brig. They traveled to Saipan and the South China Sea where the Sea Cat operated in a wolf pack. He landed on Saipan 7 July 7, as the battle was coming to an end. He served with a firefighting crew on the beach for pilots making emergency or crash landings. Alt remained on Saipan through early 1945. He was stationed on Tinian in July, and recalls when the Enola Gay landed. He returned to the US and was discharged in March of 1945.
Date:
August 24, 2004
Creator:
Alt, Thomas
Object Type:
Text
System:
The Portal to Texas History
WxWindows Interface for CALE
wxWindows is an Open Source, platform independent, User Interface (UI) which has been in development for over eleven years (http://www.wxwindows.org). Currently wxWindows is actively supported for the Linux/Unix (X11, Motif and GTK+), Mac OS 9 and X, all Win32 OSes, MGL, and OS/2 operating systems. wxWindows is written in C++ using an object oriented programming framework; it is a reasonably lightweight API (called wxWidgets) sitting over the native graphics packages of the various platforms it supports. The original version of CALE was written for the basic target platform of Unix using X11 as the graphics package. There have been separate efforts to port the code to Mac OS 9, Mac OS X, Win32, Windows Services for Unix (SFU) and CygWin. Each of these used a variety of different graphical interface approaches and build/make systems. For instance Windows SFU and CygWin could still only use X11 graphics. So could the Win32 version, if a X11 server library and client software were installed. A native Win32 version of CALE was contemplated, but never started. The Macintosh versions were completed but never widely distributed to the users. Given the growing code version support issues, and the slow deviation from the portable code model …
Date:
November 24, 2004
Creator:
Amala, P; Egner, C & Hagelberg, J
Object Type:
Article
System:
The UNT Digital Library
Design and Status of the Visa II Experiment.
VISA II is the follow-up project to the successful Visible to Infrared SASE Amplifier (VISA) experiment at the Accelerator Test Facility (ATF) in Brookhaven National Lab (BNL). This paper will report the motivation for and status of the two main experiments associated with the VISA II program. One goal of VISA II is to perform an experimental study of the physics of a chirped beam SASE FEL at the upgraded facilities of the ATF. This requires a linearization of the transport line to preserve energy chirping of the electron beam at injection. The other planned project is a strong bunch compression experiment, where the electron bunch is compressed in the chicane, and the dispersive beamline transport, allowing studies of deep saturation.
Date:
March 24, 2004
Creator:
Andonian, G.
Object Type:
Article
System:
The UNT Digital Library
Altus Times (Altus, Okla.), Vol. 105, No. 294, Ed. 1 Tuesday, February 24, 2004
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
February 24, 2004
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 105, No. 319, Ed. 1 Wednesday, March 24, 2004
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
March 24, 2004
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 106, No. 46, Ed. 1 Monday, May 24, 2004
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
May 24, 2004
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 106, No. 73, Ed. 1 Thursday, June 24, 2004
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
June 24, 2004
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 106, No. 124, Ed. 1 Tuesday, August 24, 2004
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
August 24, 2004
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 106, No. 151, Ed. 1 Friday, September 24, 2004
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
September 24, 2004
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 106, No. 176, Ed. 1 Sunday, October 24, 2004
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
October 24, 2004
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 106, No. 196, Ed. 1 Wednesday, November 24, 2004
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
November 24, 2004
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 106, No. 222, Ed. 1 Friday, December 24, 2004
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
December 24, 2004
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Analysis of the carbon-related 'blue' luminescence in GaN
The properties of a broad 2.86 eV photoluminescence band in carbon-doped GaN were studied as a function of C-doping level, temperature, and excitation density. The results are consistent with a C{sub Ga}-C{sub N} deep donor-deep acceptor recombination mechanism as proposed by Seager et al. For GaN:C grown by molecular-beam epitaxy (MBE) the 2.86 eV band is observed in Si co-doped layers exhibiting high n-type conductivity as well as in semi-insulating material. For low excitation density (4 W/cm{sup 2}) the 2.86 eV band intensity decreases as a function of cw-laser exposure time over a period of many minutes. The transient behavior is consistent with a model based on carrier diffusion and charge trapping-induced Coulomb barriers. The temperature dependence of the blue luminescence below 150 K was different for carbon-contaminated GaN grown by metalorganic vapor phase epitaxy (MOVPE) compared to C-doped MBE GaN.
Date:
September 24, 2004
Creator:
Armitage, R.; Yang, Q. & Weber, E.R.
Object Type:
Article
System:
The UNT Digital Library
SMA DOE Student Fellowship Initiative
Steel companies in many areas of the country have found it increasingly difficult to attract talented recent graduates of college and university engineering and applied science programs to the Electric Arc Furnace iron & steel industry. College student involvement in co-operative programs at steel companies can attract needed talent to the industry. Additionally, certain R & D needs identified in the Steel Industry Technology Roadmap are addressed as co-operative program activities. The Steel Manufacturers Association (''SMA'') therefore established a co-operative education program for selected college students who have completed the first or second year of a four or five-year college program, to be recognized as SMA Co-Operative Fellows, in regard to their summer and fall semester projects with SMA's member companies.
Date:
December 24, 2004
Creator:
Association, Steel Manufacturers
Object Type:
Report
System:
The UNT Digital Library
Estimation of Particle Flux and Remineralization Rate from Radioactive Disequilibrium
Reactive radionuclides, such as the thorium isotopes, show measurable deficiencies in the oceanic water column because of their removal by chemical scavenging due to the particle flux. Measurement of the deficiency, coupled with measurement of the radionuclide concentration in particles, allows a determination of the effective particle sinking velocity. Results to date suggest that the effective particle sinking velocity is remarkably invariant with depth. This leads to the tentative suggestion that POC concentration profiles may, to a good approximation, be used directly to determine length scales for the remineralization of sinking organic matter. Further measurements are in progress to test this idea and to evaluate its limitations. Knowledge of the remineralization length scale is essential to an evaluation of the efficiency of the biological pump as a means for deep sequestering of carbon in the ocean.
Date:
May 24, 2004
Creator:
Bacon, Michael P. & Francois, Roger
Object Type:
Report
System:
The UNT Digital Library
Faculty Recital: 2004-03-24 - Tony Baker, trombones and Steven Harlos, piano
Access:
Use of this item is restricted to the UNT Community
Recital performed at UNT School of Music Recital Hall on March 24, 2004 at 8:00 pm.
Date:
March 24, 2004
Creator:
Baker, Tony (Trombonist); Harlos, Steven, 1953-; Soph, Ed; Murphy, John P. (John Patrick) & Seaton, Lynn
Object Type:
Sound
System:
The UNT Digital Library
Correlates of Stress in People Living with HIV/AIDS
This poster suggests that a biopsychosocial approach may be beneficial to people living with HIV/AIDS to reduce stress.
Date:
March 24, 2004
Creator:
Ballinger, Julie & Vosvick, Mark A.
Object Type:
Poster
System:
The UNT Digital Library